Typewriting machine



Aug. 23, 1932. c. w CRUMRINE. 1,373,556

TYPEWRITING MACHINE Filed March 18. 1931 INVENTOR CHESTER w. CRUPIRINE I ATTORNEY Patented Aug. 23, 1932 UNITED STATES PATENT OFFICE CHESTER W. CRUMRINE, OF ROCHESTER, NEW YORK, ASSIGNOR '10 ELECTROMATIG TYPEWRITERS, ING, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK TYPEWBITING MACHINE Application filed larch 18, 1931. Serial No. 523,517.

This invention relates to improvements in typewritingzanachines, and particularl to devices for feeding the paper work s eet. The'principal object of this invention to provide simple andJinexpensive means for feeding the work sheet so that successive lines will appear parallel with each other, even when those lines are near or at the bottom of the work piece.

Another object of the invention is to provide improved paper feeding-devices which are fixed in the carriage frame against lateral thrust relative tothe platen, which thrust would be liable to disarrange a plurality of superimposed work sheets with carbons between them.

More specifically, the object of the invention is to provide marginal paper feeding rollers normally fixed against rotation on arevoluble shaft and engaging the platen above the printing point, and also normally fixed against lateral movement in the carriage relative to the platen, so that the rollers turn atthe same speed to feed all parts of the Work sheet in parallel lines.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear from the following description when head in' conjunction with the accompanying drawing, the novel features being pointed out in the claims following the specification.

In the drawing:

Fig. 1 is a front elevation of the carnage ofatypewriting machine, parts being shown in: section and others omitted or broken away for clearness, and illustrating one application of the present invention;

Fig. 2 is a transverse vertical section of the same. taken substantially on line 22 of Fig. 1 and looking in the direction of the arrows at said line, and

Fig. 3 is a front elevation, partly in section, of a modified form of paper feed roller.

Referring particularly to the drawing, in

which like reference numerals refer to the same part in all the figures, 1 indicates the cross rail of the carriage frame having the end plates 2 and 3 in which a cylindrical platen 4 is revolubly mounted. The plates 2 and 3 are rigidly connected in the rear of the platen by means of cross rods 5 and 6. The carriage is movable transversely of the frame on anti-friction bearings arranged between the cross rail 1 and guideways 7 and 8 on the'frame. As usual in the art, the carriage is moved for letter spacing by-means of a springmotor and in a power operated machine may be returned for beginning a new line by power driven devices. When such a machine is rapidly operated, there is considerable shock exerted on the parts when the carriage is suddenly arrested by the engagement of the margin or tabular stops, resulting in end thrust of the paper feeding devices on the platen and causing a disarrangement of the work sheets particularly when a plurality of superimposed sheets with carbons between them are arranged on the platen and the writing appears near the bot tom or end of the sheet.

In the embodiment illustrated in Figs. 1 and-2, a pair of margin feed rollers 10 and 11 are secured on a shaft 12, revolubly mounted in the free forward ends of a pair of arms 13 and 14 extending forwardly from the cross rod 6 on which they are pivotally mounted. By this arrangement, the arms 13 and 14 and shaft 12 constitute in the rod 6. At their rear ends, the arms may be connected by means of a rod 6' for reinforcing the bail. In the arrangement shown, the rollers 10 and 11 engage the platen above the printing point, and are resiliently engaged with the platen by means of springs 15 and 16, each connecting one of the arms 13 or 14 with the corresponding end plate of the carriage.

Each of the rollers 10 and 11 comprises a core or hub 17 frictionally mounted on the effect a bail pivoted on shaft 12 to turn therewith. A. rubber sheath or cover 18 is frictionally mounted on the hub 17 to turn therewith and frictionally engages the platen or a work sheet arranged thereon. and serves to feed the sheet forwardly when the platen is turned for line spacing by sultable instrumentalities engaging its ratchet wheel 4. A spring 19 is arranged in the hub 17 to resiliently engage the shaft and retains the roller against rotation on the shaft or lateral movement thereon during the normal operation of the machine. However, 1t may be adjusted laterally against the resiliency of the spring to properly engage the margin ofthe work sheet.

In a machine of this character, it is desirable to provide means for preventing end thrust of the shaft, thus insuring a relation between the feed rollers and the platen. To this end, the ends of shaft 12 extend through the arms 13 and 14 and bear against theinner ends of stops 20 and 21 mounted in the end plates 2 and 3 of the carriage. Each of the stops 20 and 21 comprises a stud 22 threaded in a tapped opening in the end plate to be adjustable therein and locked in adjusted position by a lock nut 23 threaded thereon into engagement with the end plate. At its inner end, it is provided with an enlarged head 24 engaged by the end of the shaft. By raising'the shaft 12, the bail may be swung on the rod 6 to disengage the rollers from the platen against the tension of the springs 15 and 16 for arranging the paper between the rollers and the platen. The heads 24 have their inner faces tapered, as shown, to guide the shaft 12 between them when the shaft is reengaged with the platen. By this arrangement, the shaft 12 is fixed against lateral or axial thrust in the carriage relative to the platen when in engagement with the platen. The bearing surfaces between the ends of the shaft and the stops 20 and 21 are sufiiciently large to afford proper engagement when a plurality of work sheets with carbons between them are arranged between the feed rollers and the platen. The adjustahility of the stops 20 and 21 affords a means for adjusting them into proper engagement with the ends of the shaft and also to compensate for any wear between the parts. Means comprising a split ring 26 arranged in a groove 27 in the shaft may be provided for retaining the shaft in its bearing in the arms.

In the modified form shown in Fig. 3, a single roller 28 is frictionally mounted on the shaft 12 and extends substantially throughout the length of the platen. It will he noted that the margin rollers turn at the same speed to feed the side margins of the work sheet forwardly at the same speed so that the written lines on the sheet appear in parallel relation to each other. By engaging the ends of the feed roll shaft with stops mounted directly on the carriage, the feed rollers are held against end thrust relative to the platen, which sometimes causes a spreading of a plurality of superimposed work sheets, when the carriage is suddenly stopped by the engagement of its stops, particularly when writing at or near the lower end of a long work sheet, resulting in an improper arrangement of the lines of writing.

Although only two embodiments of the invention are shown and describedherein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claims.

I claim:

1. In a typewriting machine, the combination of a carriage, a platen revolubly mounted therein, a bail pivoted in the carriage to swing toward and from the platen and .comprising a shaft, a feed roller on said shaft, means for swinging the bail to engage the feed roller with the platen, and means on the Carriage arranged axially of said shaft for fixing the shaft against axial thrust when the feed roller engages the platen.

2. In a type'writing machine, the combination of a carriage, a platen revolubly mounted therein, a bail pivoted in the carriage to swing toward and from the platen and comprising a shaft, a feed roller on said shaft, means for swinging the bail to engage the feed roller with the platen, and a stop on the carriage arranged in'axial alinement with the shaft for retaining the shaft against axial thrust when the feed roller engages the platen.

3. In a typewriting machine, the combination of a carriage, a platen rovolubly mounted therein, a bail pivoted in the carriage to swing toward and from-the platen and comprising a shaft, a feed rollerv on said shaft, means for swinging the bail to engage the feed roller with the platen, and a pair of stops on the carriage arranged to engage the ends of the shaft when the feed roller engages the platen for retaining the shaft against axial thrust in either direction when the feed roller engages the platen.

4. In a typewriting machine, the combination of a carriage, a platen revolubly mounted therein, a bail pivoted in the carriageto swing toward and from the platen and comprising a shaft, a feed roller on said shaft, means for swinging the bail to engage the feed roller with the platen, and a stop adjustably mounted on the carriage and 'arranged to engage the end of the shaft when the roller engages the platen.

5. In a typcwriting machine, the combination of a carriage, a platen revolubly mounted therein, a bail pivoted in the carriage to swing toward and from the platen and comprising a revoluble shaft, a pair of marginal feed rollers mounted on said shaft to turn therewith, and a stop on the carriage arranged to engage the end of the shaft to retain it against axial thrust.

6. In a typewriting machine, the combination of a carriage, a platen revolubly mounted therein, a bail pivoted in the carriage to swing toward and fromthe platen and comprising a revoluble shaft, a feed roller mounted on said shaft to turn therewith, a pair of stops on the carriage adapted to releasably engage the opposite ends of the shaft to retain the shaft against end thrust, and means on said stops for guiding the shaft into engagement therewith when the bail is swung to engage the rollers with the platen. I

In witness whereof, I have hereunto signed my name.

CHESTER W. CRUMRINE. 

